Sensitivity adjusting equipment of photoelectric smoke detector

ABSTRACT

A sensitivity adjusting equipment applied to a photoelectric smoke detector is provided. The photoelectric smoke detector includes a luminous component for providing an input light and a detecting component for receiving an even output light. The sensitivity adjusting equipment includes a light-scattering device having a scattering component and an adjustable hole for scattering the input light evenly and adjusting an intensity of the input light so as to output the even output light to the detecting component. The sensitivity adjusting equipment also includes a movable platform having a first brace connected to the photoelectric smoke detector and a supporting base having a second brace connected to the light-scattering device. The movable platform is moved to make the photoelectric smoke detector and the light-scattering device combined to adjust the sensitivity of the photoelectric smoke detector.

FIELD OF THE INVENTION

[0001] The present invention is related to photoelectric type smokedetectors, and more particular to a sensitivity adjusting equipment ofthe photoelectric smoke detector.

BACKGROUND OF THE INVENTION

[0002] The working principle of the photoelectric smoke detectorsemployed in detecting the fire and releasing the alarm is that thecombustion particles entering the detector's chamber produce theinfrared light (IR) scattering and causing IR energy to be detected bythe photodiode. The intensity of the light sensing by an IR photodiodereceiver will be transformed into an electrical signal and sent to thefire alarm receiver or the fire alarm siren by the subsequent electricalcircuits. According to the standards setting up for different places,smoke detectors with different sensitivity should be used to detect thespecified concentration of the smoke. Therefore, the sensitivity of theprocessing circuit of the signal amplifier of the detector should beadjusted to the required value on the production line. The existingmethod is putting the detector into a smoke producer with certainconcentration and adjusting the detector accordingly. This method isquite straight-forward and accurate. However, the equipment is veryexpensive. Besides, it needs to wait until the smoke producing is steadyso that the operating is quite inconvenient and very time-consuming.

[0003] Keep the drawbacks of the prior art in mind, and employexperiments and research full-heartily and persistently, the sensitivityadjusting equipment of a photoelectric smoke detector is finallyconceived by the applicants.

SUMMARY OF THE INVENTION

[0004] It is therefore an object of the present invention to propose asensitivity adjusting equipment applied to a photoelectric smokedetector.

[0005] It is therefore another object of the present invention topropose a light-scattering device applied to a photoelectric smokedetector for adjusting the sensitivity of the photoelectric smokedetector.

[0006] According to the aspect of the present invention, thephotoelectric smoke detector includes a luminous component for providingan input light and a detecting component for receiving an even outputlight. The sensitivity adjusting equipment includes a light-scatteringdevice having a scattering component and an adjustable hole forscattering the input light evenly and adjusting an intensity of theinput light so as to output the even output light to the detectingcomponent.

[0007] Preferably, the luminous component of the sensitivity adjustingequipment is an infrared LED.

[0008] Preferably, the input light of the sensitivity adjustingequipment is an infrared ray.

[0009] Preferably, the detecting component of the sensitivity adjustingequipment is an infrared detector.

[0010] Preferably, the scattering component of the sensitivity adjustingequipment has the inner surface coating with a material to scatter thelight evenly.

[0011] Preferably, the sensitivity adjusting equipment further includesa movable platform having a first brace connected to the photoelectricsmoke detector.

[0012] Preferably, the sensitivity adjusting equipment further includesa supporting base having a second brace connected to thelight-scattering device. Thus, the movable platform is moved to make thephotoelectric smoke detector and the light-scattering device combined toadjust the sensitivity of the photoelectric smoke detector.

[0013] Preferably, the sensitivity adjusting equipment further includesa first component and a second component.

[0014] Preferably, the first component of the sensitivity adjustingequipment further includes a first hole passing the input lighttherethrough for scattering the input light evenly and outputting evenlight.

[0015] Preferably, the second component of the sensitivity adjustingequipment further includes a second hole for receiving the even lightand outputting the output light.

[0016] Preferably, the sensitivity adjusting equipment further includesa partition and is disposed between the first component and the secondcomponent for transmitting the even light into the second component viathe adjustable hole. Thereby, the output light is outputted from thesecond hole at a specific intensity.

[0017] Preferably, the adjustable hole of the sensitivity adjustingequipment is disposed on the partition.

[0018] Preferably, the adjustable hole of the sensitivity adjustingequipment is adjusted by means of controlling a screw embedded in theadjustable hole.

[0019] According to another aspect of the present invention, thelight-scattering device includes a first component having a first holepassing an input light therethrough for scattering the input lightevenly and outputting even light, a second component having a secondhole for receiving the even light and outputting an output light, and apartition disposed between the first component and the second componentfor transmitting the even light into the second component via theadjustable hole. Thereby, the output light is outputted from the secondhole at a specific intensity.

[0020] Preferably, the first component and the second component of thelight-scattering device include a top plate and a down plate in common.

[0021] Preferably, the adjustable hole of the light-scattering device isadjusted by means of controlling a screw embedded in the adjustablehole.

[0022] Preferably, the light-scattering device has the inner surfacecoating with a material to scatter the light evenly.

[0023] According to another aspect of the present invention, thephotoelectric smoke detector includes a luminous component for providingan input light and a detecting component for receiving an even outputlight. The light-scattering device of the sensitivity adjustingequipment includes a scattering component and an adjustable hole forscattering the input light evenly and adjusting the intensity of theinput light so as to output the even output light to the detectingcomponent. The light-scattering device includes a movable platformhaving a first brace connected to the photoelectric smoke detector. Thelight-scattering device includes a supporting base having a second braceconnected to the light-scattering device. The movable platform is movedto make the photoelectric smoke detector and the light-scattering devicecombined to adjust the sensitivity of the photoelectric smoke detector.

[0024] Preferably, the luminous component of the sensitivity adjustingequipment is an infrared LED.

[0025] Preferably, the input light of the sensitivity adjustingequipment is an infrared ray.

[0026] Preferably, the detecting component of the sensitivity adjustingequipment is an infrared detector.

[0027] Preferably, the light-scattering device of the sensitivityadjusting equipment further includes a first component and a secondcomponent.

[0028] Preferably, the first component of the sensitivity adjustingequipment further includes a first hole passing the input lighttherethrough for scattering the input light evenly and outputting evenlight.

[0029] Preferably, the second component of the sensitivity adjustingequipment further includes a second hole for receiving the even lightand outputting an output light.

[0030] Preferably, the sensitivity adjusting equipment further includesa partition and is disposed between the first component and the secondcomponent for transmitting the even light into the second component viathe adjustable hole. Thereby, the output light is outputted from thesecond hole at a specific intensity.

[0031] Preferably, the adjustable hole of the sensitivity adjustingequipment is disposed on the partition.

[0032] Preferably, the adjustable hole of the sensitivity adjustingequipment is adjusted by means of controlling a screw embedded in theadjustable hole.

[0033] Preferably, the first component and the second component of thesensitivity adjusting equipment have a top plate and a down plate incommon.

[0034] Preferably, the light-scattering device of the sensitivityadjusting equipment has the inner surface coating with a material toscatter the light evenly.

BRIEF DESCRIPTION OF THE DRAWINGS

[0035]FIG. 1 is the schematic view of the combination structure of thesmoke detector and the light-scattering device according to thepreferred embodiment of present invention;

[0036]FIG. 2(a) is the schematic view of the structure decompositionfigure of the light-scattering device according to the preferredembodiment of the present invention;

[0037]FIG. 2(b) is the down plane view drawing of the light-scatteringdevice according to the preferred embodiment of the present invention;

[0038]FIG. 3 is the schematic view of the sensitivity adjustingequipment of the photoelectric smoke detector according to the preferredembodiment of the present invention.

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENT

[0039] Please refer to FIGS. 1 and 2 showing the combination structureof the photoelectric smoke detector and the light-scattering device, andthe structure decomposition figure of the light-scattering deviceaccording to the preferred embodiment of the present invention. As shownin FIG. 1, the photoelectric smoke detector 10 is composed of a luminouscomponent and a detecting component, in which the luminous component isan infrared LED 11 and the detecting component is an infrared detector12. Meanwhile, the infrared LED 11 is used to provide an infrared ray tothe infrared detector 12. The light-scattering device 13 is mounted inthe photoelectric smoke detector 10.

[0040] FIGS. 2(a) and 2(b) are the structure decomposition figure andthe down plane view drawing of the light-scattering device respectivelyaccording to the preferred embodiment of the present invention. Thelight-scattering device 13 includes the top plate 141 and the down plate142. The top plate and down plate are fasten up by screws as shown inFIG. 1. The light-scattering device 13 includes the first component 132having the first hole 134, the second component 133 having the secondhole 135 and the partition 131 having the adjustable hole 136 beingdisposed between the first component 132 and the second component 133respectively (See FIG. 2(b).). Meanwhile, the location of the first hole134 is corresponding to the light outlet of the infrared diode 1, andthe location of the second hole 135 is corresponding to the lightentrance of the infrared detector 12. Thus, the infrared ray outputsfrom the light outlet, which goes through the first hole 134 and intothe first component 132. Since the inner surface of the light-scatteringdevice 13 is coated with a material (for example: barium sulfate), whichcan scatter the light evenly, thereby causing the infrared ray to bescattered evenly. The dimension of the adjustable hole is controlled byfastening up the depth of an embedded screw (See FIG. 2(b).), whichcontrols the intensity of the evenly scattering infrared raytransmitting to the second component 133. Thus, when more infrared raysare expecting to enter the infrared detector 12, then the screw 137 isscrewed counter-clockwise to increase the length of the slot. Otherwise,when less infrared rays are expecting to enter the infrared detector 12,then the screw 137 is screwed clockwise to decrease the length of theslot. Therefore, the amount of the infrared rays receiving by the lightentrance of the infrared detector 12 through the second hole 135 of thesecond component 133 can be adjusted.

[0041]FIG. 3 is showing another preferred embodiment of the sensitivityadjusting equipment of the photoelectric smoke detector. This equipmentincludes a pedestal 31, a movable platform 32, a supporting base 33, atransmission shaft 34, and a control unit 35 upon the pedestal 31. Thetransmission shaft 34 is supporting by the first shield 36 and thesecond shield 37, and it goes through the movable platform 32. Besides,the control unit 35 is connected to the transmission shaft 34 throughthe first shield 36. The movable platform 32 is connected to a firstbrace 38, and the supporting base 33 is connected to a second brace 39.The first brace 38 is connected to the smoke detector 10, and the secondbrace 39 is connected to the light-scattering device 13.

[0042] The control unit 35 further includes a lead screw 40. The leadscrew 40 can be rotated by choosing either the manual mode or theautomatic mode. Also, the rotation of the transmission shaft ispropelled through the lead screw 40. Thus, the movable platform can bemoved back and forth on the pedestal 31 to make the photoelectric smokedetector and the light-scattering device combined to adjust thesensitivity of the photoelectric smoke detector. The connectingconfiguration is showing in FIG. 1.

[0043] The equipment of this case can be used in the production and thetest procedure of the smoke detecting siren of fire alarm. When thesmoke with known concentration goes into the working area of the smokedetector to the certain value, then the infrared detector will sense theintensity of the light corresponding to the smoke concentration. Throughthe light-scattering device to adjust the amount of output lightcorresponding to this concentration of smoke, the gains of the circuitsof the photoelectric smoke detector can be promptly set and adjusted byusing this light-scattering device with a pre-setting value in order tospeed up the production. Through real testing, this equipment candecrease the time of the production and the test from approximately 8minutes to within 2 minutes to save the testing time and the man power.

[0044] Although the present invention has been described and illustratedin an example of the most preferred embodiment, however, theconstructional characteristics of the present invention are not limitedby that. The variations and modifications that anyone who is familiarwith the skill can think of easily which fall within the spirit andscope of the present invention as defined by the appended claims shouldbe included.

What is claim is:
 1. A sensitivity adjusting equipment applied to aphotoelectric smoke detector, wherein said photoelectric smoke detectorcomprises a luminous component for providing an input light and adetecting component for receiving an even output light, comprising: alight-scattering device having a scattering component and an adjustablehole for scattering said input light evenly and adjusting an intensityof said input light, so as to output said even output light to saiddetecting component.
 2. The sensitivity adjusting equipment according toclaim 1, wherein said luminous component is an infrared LED.
 3. Thesensitivity adjusting equipment according to claim 1, wherein said inputlight is an infrared ray.
 4. The sensitivity adjusting equipmentaccording to claim 1, wherein said detecting component is an infrareddetector.
 5. The sensitivity adjusting equipment according to claim 1,wherein said scattering component has an inner surface coating with amaterial to scatter the light evenly.
 6. The sensitivity adjustingequipment according to claim 1, further comprising a movable platformhaving a first brace connected to said photoelectric smoke detector. 7.The sensitivity adjusting equipment according to claim 1, furthercomprising a supporting base having a second brace connected to saidlight-scattering device, thus having said movable platform moved to makesaid photoelectric smoke detector and said light-scattering devicecombined, to adjust a sensitivity of said photoelectric smoke detector.8. The sensitivity adjusting equipment according to claim 1, furthercomprising a first component and a second component.
 9. The sensitivityadjusting equipment according to claim 8, wherein said first componentfurther comprises a first hole passing an input light therethrough forscattering said input light evenly and outputting even light.
 10. Thesensitivity adjusting equipment according to claim 8, wherein saidsecond component further comprises a second hole for receiving said evenlight and outputting an output light.
 11. The sensitivity adjustingequipment according to claim 8, further comprising a partition anddisposed between said first component and said second component fortransmitting said even light into said second component via saidadjustable hole, thereby said output light being outputted from saidsecond hole at a specific intensity.
 12. The sensitivity adjustingequipment according to claim 11, wherein said adjustable hole isdisposed on said partition.
 13. The sensitivity adjusting equipmentaccording to claim 11, wherein said adjustable hole is adjusted by meansof controlling a screw embedded in said adjustable hole.
 14. Alight-scattering device applied to a photoelectric smoke detector foradjusting a sensitivity of said photoelectric smoke detector,comprising: a first component having a first hole passing an input lighttherethrough for scattering said input light evenly and outputting evenlight; a second component having a second hole for receiving said evenlight and outputting an output light; and a partition disposed betweensaid first component and said second component for transmitting saideven light into said second component via said adjustable hole, therebysaid output light being outputted from said second hole at a specificintensity.
 15. The light-scattering device according to claim 14,wherein said first component and said second component having a topplate and a down plate in common.
 16. The light-scattering deviceaccording to claim 14, wherein said adjustable hole is adjusted by meansof controlling a screw embedded in said adjustable hole.
 17. Thelight-scattering device according to claim 14, wherein saidlight-scattering device has an inner surface coating with a material toscatter the light evenly.
 18. A sensitivity adjusting equipment appliedto a photoelectric smoke detector, wherein said photoelectric smokedetector comprises a luminous component for providing an input light anda detecting component for receiving an even output light, comprising: alight-scattering device having a scattering component and an adjustablehole for scattering said input light evenly and adjusting an intensityof said input light, so as to output said even output light to saiddetecting component; a movable platform having a first brace connectedto said photoelectric smoke detector; and a supporting base having asecond brace connected to said light-scattering device, thus having saidmovable platform moved to make said photoelectric smoke detector andsaid light-scattering device combined, to adjust a sensitivity of saidphotoelectric smoke detector.
 19. The sensitivity adjusting equipmentaccording to claim 18, wherein said luminous component is an infraredLED.
 20. The sensitivity adjusting equipment according to claim 18,wherein said input light is an infrared ray.
 21. The sensitivityadjusting equipment according to claim 18, wherein said detectingcomponent is an infrared detector.
 22. The sensitivity adjustingequipment according to claim 18, wherein said light-scattering devicefurther comprising a first component and a second component.
 23. Thesensitivity adjusting equipment according to claim 22, wherein saidfirst component further comprises a first hole passing an input lighttherethrough for scattering said input light evenly and outputting evenlight.
 24. The sensitivity adjusting equipment according to claim 22,wherein said second component further comprises a second hole forreceiving said even light and outputting an output light.
 25. Thesensitivity adjusting equipment according to claim 22, furthercomprising a partition and disposed between said first component andsaid second component for transmitting said even light into said secondcomponent via said adjustable hole, thereby said output light beingoutputted from said second hole at a specific intensity.
 26. Thesensitivity adjusting equipment according to claim 25, wherein saidadjustable hole is disposed on said partition.
 27. The sensitivityadjusting equipment according to claim 25, wherein said adjustable holeis adjusted by means of controlling a screw embedded in said adjustablehole.
 28. The sensitivity adjusting equipment according to claim 22,wherein said first component and said second component having a topplate and a down plate in common.
 29. The sensitivity adjustingequipment according to claim 22, wherein said light-scattering devicehas an inner surface coating with a material to scatter the lightevenly.